GNU make 3.82 has introduced some backward incompatibilities. As a result,
glibc cannot be built with make 3.82. Here's what happens:

pipping@bogus ~/glibc-2.11.2/manual $ ~/make-3.82/make  -n
Makefile:235: *** mixed implicit and normal rules.  Stop.
pipping@bogus ~/glibc-2.11.2/manual $ 

Here's what's supposed to happen:

pipping@bogus ~/glibc-2.11.2/manual $ ~/make-3.81/make  -n
pwd=`pwd`; \
        /usr/bin/perl libm-err-tab.pl $pwd/.. > libm-err-tmp
/bin/sh ../scripts/move-if-change libm-err-tmp libm-err.texi
touch stamp-libm-err
sed -e 's,[{}],@&,g'                            \
            -e 's,/\*\(@.*\)\*/,\1,g'                   \
            -e 's,/\*  *,/* @r{,g' -e 's,  *\*/,} */,'  \
            -e 's/\(@[a-z][a-z]*\)@{\([^}]*\)@}/\1{\2}/g'\
            examples/stpcpy.c | expand > stpcpy.c.texi.new
mv -f stpcpy.c.texi.new stpcpy.c.texi
[..]

The offending line is

  $(objpfx)stubs ../po/manual.pot $(objpfx)stamp%:

Current git HEAD has it, too.